Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d56b6ac8ca3db7…

MALICIOUS

PDF

91.6 KB Created: 2021-08-10 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 80ee19db52f8fb666751eccf9dd5efcd SHA-1: 3321e8b987f4a8cc1260bb9d069850a0745500e3 SHA-256: a8d56b6ac8ca3db72f58039253374383b4546df8d10632d0f23dffc134b96dd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=what+is+the+best+software+for+live+video+streaming PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7971618c7---64895949007.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/tedabupifozuj.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/12cc1a92da2bd8e6ee4c36961561a6d4/puwilebupe.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916472a17b---gamukokolekomadewonivifo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31266e1743---geweturopuduvufurupomol.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/miles.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd26f43a49---21745170060.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/36417099639.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/belimuputesana.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/610ffa467b6c0965317b0fbf943bc44a/xiguxebukizemana.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/6419360144.pdfIn PDF document text
    • https://anjingliar.com/contents//files/63330562565.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/92877252025.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/62225638221.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102aa5431831---jebegifasowekavexix.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/genokanupukawokozaf.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/jadixinob.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/85139122694.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5kh4t1t1ksbn3en5djqqv72ql0/23837767424.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/48913948696.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/vixukovutonexifarutiruw.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b84fdadc029---gegowipesupibanetejunivo.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/vupewu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/digudezere.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 11088 bytes
SHA-256: b7efdedaad39a257fb821422bdcb43815992fd3991be371cd7014d623e089857
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 17716 bytes
SHA-256: 305846d73f8053ac73a2076ca7c3f19f62790777565dc26313489cfda57d0615

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